Method for measuring fracture toughness of large thickness, high toughness hard film on metal surface

A metal surface, fracture toughness technology, applied in the direction of testing material hardness, etc., can solve problems such as improper loading capacity, lowering the cracking threshold of hard film, etc., to achieve the effect of improving accuracy, accurate results and simple operation process

Active Publication Date: 2022-03-22
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method adopts the method of multiple indentation with small load loading and single indentation with large load to promote the initiation and propagation of cracks, thereby obtaining effective cracks and realizing the quantitative evaluation of the fracture toughness of large-thickness hard films, which significantly reduces The cracking threshold of the hard film is solved, the problem that the improper loading capacity is difficult to induce the initiation and propagation of effective cracks in the traditional method is solved, and the accuracy of the fracture toughness result is improved

Method used

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  • Method for measuring fracture toughness of large thickness, high toughness hard film on metal surface
  • Method for measuring fracture toughness of large thickness, high toughness hard film on metal surface
  • Method for measuring fracture toughness of large thickness, high toughness hard film on metal surface

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Embodiment 1

[0048] The method of the present embodiment comprises the following steps:

[0049] Step 1, the Vickers indenter is installed on the microhardness tester, and then the TiN film vapor deposited on the surface of the M2 high speed steel is placed on the stage of the microhardness tester; the vapor deposition on the surface of the M2 high speed steel is The thickness of the TiN film is 25.6 μm;

[0050] Step 2. Adjust the position of the stage until the surface morphology of the TiN film vapor deposited on the surface of the M2 high-speed steel can be clearly observed from the eyepiece of the microhardness tester, and then fix the position of the stage;

[0051] Step 3. Carry out a small load loading test on the TiN film vapor deposited on the surface of M2 high speed steel placed on the stage in step 2. The specific process is: first, the TiN film vapor deposited on the surface of M2 high speed steel is subjected to a preset load Carry out loading and holding in sequence, and t...

Embodiment 2

[0075] The method of the present embodiment comprises the following steps:

[0076] Step 1, the Vickers indenter is installed on the microhardness tester, and then the TiN film vapor deposited on the surface of the M2 high speed steel is placed on the stage of the microhardness tester; the vapor deposition on the surface of the M2 high speed steel is The thickness of the TiN film is 25.6 μm;

[0077] Step 2. Adjust the position of the stage until the surface morphology of the TiN film vapor deposited on the surface of the M2 high-speed steel can be clearly observed from the eyepiece of the microhardness tester, and then fix the position of the stage;

[0078]Step 3. Carry out a small load loading test on the TiN film vapor deposited on the surface of M2 high speed steel placed on the stage in step 2. The specific process is: first, the TiN film vapor deposited on the surface of M2 high speed steel is subjected to a preset load Carry out loading and holding in sequence, and th...

Embodiment 3

[0089] The method of the present embodiment comprises the following steps:

[0090] Step 1, the Vickers indenter is installed on the microhardness tester, and then the CrN film deposited on the surface of the M2 high speed steel is placed on the stage of the microhardness tester; the vapor deposition on the surface of the M2 high speed steel is The thickness of the CrN film is 15.5 μm;

[0091] Step 2. Adjust the position of the stage until the surface morphology of the CrN film vapor deposited on the surface of the M2 high-speed steel can be clearly observed from the eyepiece of the microhardness tester, and then fix the position of the stage;

[0092] Step 3. Carry out a small load loading test on the CrN film vapor deposited on the surface of M2 high speed steel placed on the stage in step 2. The specific process is: first, according to the preset load, the CrN film vapor deposited on the surface of M2 high speed steel Carry out loading and holding in sequence, and then co...

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Abstract

The invention discloses a method for measuring the fracture toughness of a hard film with large thickness and high toughness on a metal surface. The method comprises: placing the hard film deposited on the metal surface by vapor phase on a stage of a microhardness tester to adjust and fix it; Then, the small load loading test is used to carry out multiple loading-holding-completely unloading prefabricated short cracks, and the large-load loading test is used to carry out a single loading-holding-unloading expansion to form elongated cracks, and the crack length is measured and calculated. Fracture toughness K IC value, repeat the test, measurement, and calculation process to obtain multiple fracture toughness K IC After the numerical value, the arithmetic mean is taken to characterize the fracture toughness. The invention adopts the method of multiple indentation under small load loading and single indentation under heavy load loading to promote the initiation and expansion of cracks, obtain effective cracks, realize quantitative evaluation of the fracture toughness of large-thickness hard films, and solve the problem of difficult to induce effective cracks. The problem of cracks improves the accuracy of fracture toughness results.

Description

technical field [0001] The invention belongs to the technical field of material mechanical performance testing, and in particular relates to a method for measuring the fracture toughness of a hard film with a large thickness and high toughness on a metal surface. Background technique [0002] Due to its excellent mechanical properties and good physical and chemical properties, hard films have been widely used in the surface strengthening of dies and precision parts. The thickness of the hard film obtained by vapor deposition is usually only a few microns, which greatly limits its application in extremely harsh and harsh environments such as nuclear power, aviation and deep sea. However, with the development and improvement of special coating devices and technologies such as ultra-high power and multiple assists, great progress has been made in the thickness of hard films. For example, CrN and Cr prepared by Sproul and others using modulated pulse magnetron sputtering devices...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/42
CPCG01N3/42
Inventor 邱龙时赵婧潘晓龙田丰张于胜
Owner 西安稀有金属材料研究院有限公司
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